Vulnerability record · CVE-2025-13836 · published 1 December 2025

CVE-2025-13836: Python uncontrolled resource consumption vulnerability

Python · Python

When reading an HTTP response from a server, if no read amount is specified, the default behavior will be to use Content-Length. This allows a malicious server to cause the client to read large amounts of data into memory, potentially causing OOM or other DoS.

6.3 CVSS 4.0 Medium EPSS 1.7% · top 21.8% CWE-400 · Uncontrolled resource consumption

6.3CVSS 4.0 base score

1.7%EPSS exploitation probability, 30 days

NoNot in CISA KEV

1Affected product versions listed by NVD

9References

3 Sep 2026Last modified by NVD

Description

CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:L/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:

Affected products

1 vulnerable configurations from NVD's CPE data, grouped by vendor and product.

Python Python

References

Link	Tags
https://github.com/python/cpython/commit/14b1fdb0a94b96f86fc7b86671ea9582b8676628	Patch
https://github.com/python/cpython/commit/289f29b0fe38baf2d7cb5854f4bb573cc34a6a15	Patch
https://github.com/python/cpython/commit/4ce27904b597c77d74dd93f2c912676021a99155	Patch
https://github.com/python/cpython/commit/5a4c4a033a4a54481be6870aa1896fad732555b5	Patch
https://github.com/python/cpython/commit/5dc101675fd22918facbbe0fecdc821502beaaf0	Patch
https://github.com/python/cpython/commit/afc40bdd3dd71f343fd9016f6d8eebbacbd6587c	Patch
https://github.com/python/cpython/issues/119451	Issue TrackingPatch
https://github.com/python/cpython/pull/119454	Issue TrackingPatch
https://mail.python.org/archives/list/security-announce@python.org/thread/OQ6G7MKRQIS3OAREC3HNG3D2DPOU34XO/	Vendor Advisory

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Same products first, then exploited flaws of the same weakness class.

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Source: NIST National Vulnerability Database (record CVE-2025-13836), CISA KEV, FIRST EPSS (scores of 2026-11-13). This page is refreshed as NVD updates the record.